Verbal Reasoning - Mental Ability Questions

A family consists of six members P, Q, R, X, Y and Z. Q is the son of R but R is not mother of Q. P and R are a married couple. Y is the brother of R. X is the daughter of P. Z is the brother of P. How many children does P have ?  

If "A" means "minus", "B" means "divided by", "C" means "plus" and "D" means "multiplied by", then

54 B 6 A 4 C 2 D 5 = ?

In the following question, select the related letter/letters from the given alternatives.

TOK : UQN : : ROL  :  ?

In the following question, select the missing number from the given series.

964, ?, 241, 120.5, 60.25

Select the related word from the given alternatives.

Yellow : Lemon :: Purple : ?

In the following question, select the related number from the given alternatives.

5 : 25 : : 6 : ?

Select the related word/letters/number from the given alternatives.

HJ : NO : : BD : ?

Select the related word/letters/number from the given alternatives.

Sukhoi : Russia : : Tejas : ?